JP3246564B2 - Circuit breaker and method of assembling the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker such as a circuit breaker for a wiring or an earth leakage breaker, and more particularly, to a structure of a connecting portion of a holder for holding a movable contact and an opening and closing mechanism for opening and closing the holder. .

[0002]

2. Description of the Related Art FIG. 9 is a longitudinal sectional view of a switching mechanism showing a conventional example of the circuit breaker. In the figure, reference numeral 1 denotes a holder of a molded resin molded product having a space formed therein, and 2 denotes a movable contact held inside the holder 1. Holder 1
Is rotatably supported on a case 3 of the circuit breaker by an integrally formed opening / closing shaft (not shown), and the movable contact 2 is rotatably supported on the holder 1 by pins 4. The illustrated holder 1 is a central pole in a three-pole circuit breaker, and left and right pole holders are integrally connected to both sides thereof by the opening / closing shaft.

The movable contact 2 is urged in the counterclockwise direction in the figure by the spring force of the current limiting spring 7 acting on the current limiting pin 5 fixed to the movable contact 2 via the current limiting latch 6. An appropriate contact pressure is applied to the fixed contact 8. The current-limiting pin 5, the current-limiting latch 6, the current-limiting spring 7, and the like constitute a current-limiting mechanism. However, since they are not directly necessary for understanding the prior art of the present invention, description thereof will be omitted. .

An opening / closing mechanism 9 fixed to the case 3 drives the holder 1 integrally with the movable contact 2 via a toggle link 11 by a spring force accumulated in an opening / closing spring 10. The toggle link 11 includes an upper link 12 and a lower link 13, and an opening / closing spring 10 is mounted between an articulating pin 14 and a handle lever 15 for connecting the upper link 12 and the lower link 13. The upper link 12 is connected to the latch 17 by a pin 16, and the lower link 13 is connected to the holder 1 by a pin 18. The lower link 13 has a bifurcated shape in which a pair of left and right arms are located outside the holder 1, and a pin 18 passes through these arms and the holder 1. The latch 17 is locked at the right end in the figure by a latch receiver (not shown), and the posture shown in the figure is maintained.

[0005] Although a detailed description is omitted, when the operation handle 20 protruding from the cover 19 is tilted rightward from the state shown in the figure, the opening / closing spring 10 for the toggle link 11 is opened.
Is reversed, the toggle link 11 collapses, the holder 1 is driven clockwise, and the movable contact 2 is separated. Also,
When a tripping device (not shown) is operated, the latch 17 is unlocked and jumps counterclockwise around the pin 21 as a fulcrum.
Again, the action of the opening / closing spring 10 is reversed and the movable contact 2 is opened.

[0006]

In the above-mentioned conventional structure, the pin 18 connecting the lower link 13 and the holder 1 penetrates the holder 1 across the left and right arms of the lower link 13. Therefore, the movable contact 2 held inside the holder 1 escapes the pin 18, and in the case shown in the drawing, the portion that interferes is formed in a mountain shape. That is, in the related art, the shape of the movable contact 2 and the shape of the holder 1 in relation to the pin 18 are restricted by the pin 18, and there is a problem that the degree of freedom of design is reduced accordingly.

Further, conventionally, since the pin 18 for connecting the holder 1 and the lower link 11 must be inserted into the holder 1 from the side, the pin 18 cannot be inserted in the case 3, and the holder 18 is provided outside the case 3. After combining the first and the opening / closing mechanism 9, they were assembled in the case 1. On the other hand, when the frame size of the circuit breaker changes, the holder 1 uses a different object because the cross-sectional area and the inter-phase distance of the conductors are different, whereas the opening / closing mechanism 9 uses the opening / closing spring for a certain range of different frame sizes. Other components are often used as they are simply by replacing 10.

In this case, as described above, according to the assembling method of connecting the holder 1 and the opening / closing mechanism 9 outside the case 3, circuit breakers having different frame sizes are mixedly flowed on the same assembly line. It was difficult. SUMMARY OF THE INVENTION It is an object of the present invention to provide a circuit breaker opening / closing mechanism in which the shapes of a movable contact and a holder are not restricted by a connecting pin of a lower link, thereby increasing a degree of freedom in design. is there. Another object of the present invention is to provide a method for assembling a circuit breaker which has improved productivity by utilizing the configuration of the circuit breaker.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a lower link projects toward a holder.
Cantilevered pin and beak near this pin
And one end on the side surface of the holder.
A groove having an opening and a projection near the groove are provided.
With the hook engaged with the projection.
And pivotally connect the holder and the lower link.
(Claim 1). Thus, the opening / closing mechanism can be combined with the holder from above to easily connect them. Then, after assembling the holder holding the movable contact into the case, an opening / closing mechanism including a toggle link is inserted into the case, and an assembling method of connecting a lower link of the toggle link to the holder is adopted. This makes it possible to mix circuit breakers having different frame sizes on the same assembly line (claim 2).

[0010]

[Action] is supported at the pin down link piece, the pin if fitted into the pin groove of the holder side does not penetrate the holder, it is also that of without being constrained movable contact is shaped by the pin. At this time, the hook of the lower link is engaged with the projection of the holder to prevent the pin from coming out of the groove. In addition, according to such a configuration, since the opening and closing mechanisms can be combined from above the holder and connected to each other, holders of various frame sizes with the movable contacts assembled therein are incorporated in the case, and each frame is attached to the case. If a common open / close mechanism is inserted into the size and connected to the holder, circuit breakers having different frame sizes can be easily assembled on the same assembly line.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a front view of a main part of the opening / closing mechanism,
2 is a side view thereof, FIG. 3 (A) is a plan view of the lower link in FIG. 1, (B) is a side view thereof, (C) is a rear view thereof, FIG. 4 is a side view of the holder in FIG. 5 is a side view showing a state in which the pin of the lower link of FIG. 3 is inserted into the groove of the holder of FIG. 4, and FIG. 6 engages the hook of the lower link with the projection of the holder by rotating the lower link from the state of FIG. FIG. 7 is a side view showing an ON state of the circuit breaker of the lower link connected to the holder, and FIG.
It is a side view which shows a state in a state. Note that the same reference numerals are used for the portions corresponding to the conventional example.

First, as shown in FIG. 3, the lower link 13 has a bifurcated shape in which left and right arms 13a are integrally connected at their upper ends by a back plate 13b, and a stepped cylindrical pin is provided at the lower end of the arm 13a. 18 are connected by caulking so that 18 protrudes to both sides . A beak-shaped hook 13c is integrally formed near the back of the arm 13a. Reference numeral 22 denotes a hole into which the joint pin 14 between the upper link 12 (FIG. 1) is inserted. On the other hand, as shown in FIG. 4, grooves 23 are formed on both side surfaces of the holder 1 as recesses into which the inner protrusions 18a of the pins 18 are fitted so as to open forward. The terminal end of the groove 23 has a semicircular shape that matches the outer diameter of the projection 18a, and the peripheral edge 23a is formed in a stepped shape in accordance with the large diameter portion at the base of the inner projection 18a. In the vicinity of the rear of the groove 23, a round projection 24 having a head with which the hook 13c of the lower link 13 is engaged is formed along the side surface of the holder.

The lower link 13 is connected to the holder 1 by the projection 18a of the pin 18 being fitted into the groove 23 and the hook 13c being engaged with the projection 24. This connection method will be described with reference to FIGS. 5 and 6. First, as shown in FIG. 5,
While the lower link 13 is slightly tilted forward (to the left in FIG. 5), the protrusion 18a is inserted into the groove 23 through the opening to the end, and then is inserted backward as shown by the arrow (to the right in FIG. 5). ) So that the hooks 13c are attached to the projections 24 as shown in FIG.
Is engaged so as to cover it.

1 and 2, reference numeral 25 denotes an opening / closing mechanism 9.
And is fixed to the case 3 (FIG. 2) by a mounting flange 25a with screws (not shown). The latch 17 is connected to a side plate 25 by a latch pin 21.
Is rotatably supported at the front end 17a.
(FIG. 2) is locked by a latch receiver (not shown) and is maintained in the state of FIG. 2 or FIG. Further, a forked handle lever 15 (not shown in FIG. 1) is also swingably supported at its distal end by a concave portion of the side plate 25.

In the OFF state of the circuit breaker of FIG.
When the operating lever 20 is operated and the handle lever 15 is tilted to the left in the figure, the action of the opening / closing spring 10 on the toggle link 11 is reversed, and the toggle link 11 which has been collapsed is extended to the state shown in FIG. The child 2 is pushed down, and the circuit breaker is turned on. At the same time, the opening / closing spring 10 is charged. When the operation handle 17 is tilted to the right in the ON state of the circuit breaker shown in FIG. 7, the toggle link 9 breaks down again, and the movable contact 2 is rapidly opened to the state shown in FIG. At this time, as shown in FIG.
The outer projection 18b of the movable contact 2 abuts against the bottom of the mounting flange 25a of the side plate 25, thereby restricting the open position of the movable contact 2. In the above ON / OFF operation of the circuit breaker, as shown in FIGS.
, The hook 13c continues to engage with the projection 24 while sliding, and the pin 18
Is held at the end of the groove 23.

As described above, in the above embodiment, the pins 18 supported by the arms 13a of the lower link 13 cantileverly fit into the grooves 23 of the holder 1 from the outside, but do not penetrate the holder 1. Therefore, even if the movable contact 2 held inside the holder 1 and the axis of the pin 18 overlap each other, they do not interfere with each other, and the shape of the movable contact 2 and the mounting position with respect to the holder 1 It can be set freely without considering its existence.

Further, the pin 18 is inserted into the groove 23 having one end opened and fitted therein, and is prevented from coming off by the engagement between the hook 13c and the projection 24. Therefore, the lower link 13 and the holder 1 are merely fitted. And can be easily connected.
This connection is performed by placing the lower link 13 on the holder 1 from above.
It is possible even in the state where it is incorporated in

Therefore, the case 3 is assembled with the movable contact 2 and the contact spring (not shown) on the holder 1.
After that, the opening / closing mechanism 9 in which components such as the latch 17, the toggle link 11, the handle lever 15, and the opening / closing spring 10 are assembled on the side plate 25 is inserted into the case 3, and the lower link 13 is connected to the holder 1. If the assembling method is adopted, the holder 1 of various frame sizes can be used.
The circuit breakers having different frame sizes can be freely assembled on the same assembly line by simultaneously flowing the case 3 incorporating the circuit board into the assembly line and incorporating the opening and closing mechanism 9 having a common outer shape into the case 3.

Further, in the illustrated embodiment, the projection 18b of the pin 18 on the side opposite to the holder is used as a stopper pin, and the stopper 18 is brought into contact with the side plate 25 to regulate the opening position of the movable contact 1. Therefore, it is not necessary to separately provide a stopper pin, and the configuration is correspondingly simplified.

[0020]

According to the present invention, the pins for connecting the lower link of the toggle link and the holder of the movable contact are cantilevered to the left and right arms of the lower link, respectively, and are fitted into the grooves on the side surfaces of the holder. With this configuration, the shapes of the movable contact and the holder are not restricted by the pins that penetrate the holder, so that the degree of freedom in design is increased and a small, high-performance circuit breaker can be advantageously configured.

[0021] Then, by engaging the hook of the lower link to the holder of the projection by inserting the pin into the groove, one end of which opens from its open end, to easily connect the holder and the lower link
Can be As a result, holders of various frame sizes to which the movable contacts are assembled are incorporated in the cases, and a common opening / closing mechanism for each frame size is inserted into these cases and connected to the holders. By assembling circuit breakers of different sizes, the number of assembly lines can be reduced, and production can be streamlined.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of an opening / closing mechanism according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

3A and 3B show a lower link in FIG. 1, wherein FIG. 3A is a plan view, FIG. 3B is a side view thereof, and FIG. 3C is a rear view thereof.

FIG. 4 is a side view of the holder in FIG.

5 is a side view showing a state where a pin of a lower link of FIG. 3 is inserted into a groove of the holder of FIG. 4;

6 is a side view of a state in which the lower link is rotated from the state of FIG. 5 and the hook of the lower link is engaged with the protrusion of the holder.

7 is a side view showing an ON state of the circuit breaker of the lower link of FIG. 3 connected to the holder of FIG. 4;

8 is a side view showing an OFF state of the circuit breaker of the lower link of FIG. 3 connected to the holder of FIG. 4;

FIG. 9 is a longitudinal sectional view of a main part of a conventional circuit breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder 2 Movable contact 3 Case 9 Opening / closing mechanism 11 Toggle link 12 Upper link 13 Lower link 13c Hook 18 Pin 23 Groove 24 Projection 25 Side plate

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Koyama 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Tsuneo Ebisawa No. 1, Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture No. 1 Fuji Electric Co., Ltd. (56) References Hikaru Hei 2-92639 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 71/12 H01H 69/00

Claims (2)

(57) [Claims] 1. An opening / closing mechanism in which an insulator holder holding a movable contact is rotatably supported by a case, and an upper link of a toggle link is connected to a latch is fixed to the case. in the circuit breaker the lower link is connected to the toggle link, cantilever supported protruding toward the holder to the lower link
Pin held and beak-shaped hook near this pin
And one end is opened on the side surface of the holder.
Groove, and a protrusion near the groove are provided, and the pin is
Fit into the groove, engage the hook with the protrusion,
A circuit breaker, wherein a holder and the lower link are rotatably connected . 2. The method according to claim 1, wherein after the holder holding the movable contact is assembled in the case, an opening / closing mechanism including the toggle link is inserted into the case, and a lower link of the toggle link is connected to the holder. Claim 1.
A method for assembling the circuit breaker according to the above.